Receiving 2 KVO notifications for a single KVC change

Question

I\'m using KVC/KVO to create a custom bindings implementation for a University project (it needs to be custom as I want to do things beyond what bindings can do, including r

Answer 1

Perhaps put an NSLog in your addObserver call, to see if you're adding two observers.

Answer 2

You're doing this:

- (void)setName:(NSString *)name
{
    [self willChangeValueForKey:@"name"];
    [contact setFirstName:name];
    [self didChangeValueForKey:@"name"];
}

But (by the sounds of it) from a non-NSManagedObject subclass. This means that Cocoa will be attempting to send KVO notifications automatically for you. You're supplementing that by sending your own too. Solutions:

• Override +automaticallyNotifiesObserversForKey: to return NO

• Change your method to:

  - (void)setName:(NSString *)name { [contact setFirstName:name]; }